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Biostatistics Exam 1(questions & answers) updated
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Biostatistics Exam 1(questions & answers) updated
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Biostatistics Exam 1(questions &answers)2024-2025 updated
box and whisker plot - correct answer ✔✔A graph that displays the highest and lowest limits of data as
whiskers, the middle two quarters of the data as a box, and the median
Percentile - correct answer ✔✔Assume that the elements in a data set are rank ordered from smallest to
largest. The values that divide a rank-ordered set of elements into 100 equal parts.
Quartiles - correct answer ✔✔Values that divide a data set into four equal parts
Location parameter - correct answer ✔✔Descriptive measures (Mean and Median) that can be used to
designate certain positions on the horizontal axis when the distribution of a variable is graphed.
ordered array - correct answer ✔✔An ordered list of data from largest to smallest or vice versa
frequency distribution - correct answer ✔✔an arrangement of data that indicates how often a particular
score or observation occurs
relative frequency distribution - correct answer ✔✔The proportion of values falling within a class
interval. Frequency/ total # of values.
statistic - correct answer ✔✔a number that describes a sample
Parameter - correct answer ✔✔a number that describes a population
frequency polygon - correct answer ✔✔special kind of line graph that can portray a frequency
distribution.
, Histogram - correct answer ✔✔A graph of vertical bars representing the frequency distribution of a set
of data.
arithmetic mean (average) - correct answer ✔✔The sum of all the values in the population/ sample
divided by the number of values.
Properties of the Mean - correct answer ✔✔1) Uniqueness: for a given set of data there is one and only
one mean.
2) Simplicity: The arithmetic mean is easily understood and calculated.
3) Affected by each value: since each value in a set of data enters into the computation of the mean.
extreme values, therefore, have an influence on the mean in some cases can so distort it that it becomes
as a measure of central tendency.
Median - correct answer ✔✔the middle score in a distribution; half the scores are above it and half are
below it
Properties of a median - correct answer ✔✔1) Uniqueness: there is only one median for a given set of
data.
2) Simplicity: easy to calculate.
3) Not affected by extreme values.
Variance - correct answer ✔✔compares how each value is with respect to the mean.
standard deviation - correct answer ✔✔the square root of the variance.
how much members of a group can vary from the mean.
Skewness - correct answer ✔✔a measure of the degree to which a distribution is asymmetrical
degrees of freedom - correct answer ✔✔The number of individual scores that can vary without changing
the sample mean. Statistically written as 'N-1' where N represents the number of subjects.
coefficient of variation - correct answer ✔✔- Good for comparing the variation of 2 data sets.
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